Carburetor



May 25, 1937.

K. G. HALL 2,081,482 CARBURETOR Filed Dec. 2, 1936 2 Sheets-Sheet l Inventor May '25, 1937.

K. G. HALL 2,081,482

GARBURETOR Filed Dec. 2, 1936 2 Sheets-Sheet 2 I j v .f/

6' 46' j I .7 a

Patented May 25, 1937 UNE'EEE STATES PATENT OFFICE 4 Claims.

The present invention relates to new and useful improvements in carburetors particularly for the internal combustion engines of automobiles and has for one of its important objects to provide, in a manner as hereinafter set forth, a device of this character which omits the usual float chamber, float, etc.

Another very important object of the invention is to provide a carburetor of the aforementioned character embodying a novel combination and arrangement of valves and connecting means therefor through the medium of which the proportions of air and fuel constituting the charge may be conveniently and accurately regulated as desired.

Other objects or" the invention are to provide a carburetor of the character described which will be comparatively simple in construction, strong, durable, highly efiicient and reliable in use, compact, light in weight and which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawings wherein like characters of reference designate corresponding parts throughout the several views, and wherein:

Figure 1 is a view in side elevation of a carburetor constructed in accordance with the present invention.

Figure 2 is a View in vertical section through the invention, taken substantially on the line 22 of Fig. 1.

Figure 3 is a horizontal sectional view, taken substantially on the line 33 of Fig. 2.

Figure 4 is a detail view in side elevation showing the means for adjusting the fuel valve operating cam.

Referring now to the drawings in detail, it will be seen that the embodiment of the invention which has been illustrated comprises a Y member which is designated generally by the reference numeral I, said Y member being of any suitable metal and including what will be hereinafter referred to as primary and secondary air intakes 2 and 3, respectively. The stem 4 of the Y member l is formed to provide a mixing chamber 5 (see Fig. 2) and said stem is provided with an apertured attaching flange 6 at its lower end. Primary and secondary air control valves 1 and 8, respectively, are mounted in the intakes 2 and 3 It will be observed that the valves 1 and 8 are of the butterfly type. Fixed at an intermediate point on the shaft 9 of the primary valve 1 is a lever 10 which is adapted for connection at one end, as at H, with an accelerator rod. An arm I2 is fixed on the shaft i3 of the secondary air valve 8.

Projecting horizontally into the Y member I in the upper portion of the mixing chamber 5 is a fuel discharge pipe IA having a downwardly directed outlet port 15 therein. The reference numeral l6 designates a seat in the fuel conduit 14. The conduit i4 is connected directly with a suitable fuel pump (not shown). Threaded in to the member I at the inner end of the fuel conduit i4 is a bushing H in which a fuel valve I8 of the needle type is rotatably and slidably mounted. The needle valve I8 is, of course, engageable on the seat [5 for controlling the discharge of fuel into the mixing chamber 5.

The reference numeral I9 designates a lever which is fixed, at an intermediate point, on the outer end portion of the needle valve [8. of the lever I9 is adapted for connection with a choke rod (not shown) as at 28. t its other end, the lever I9 terminates in a T head 2|. The reference numeral 22 designates a link which connects the lever 59 to the lever IQ for actuation thereby. One end of the link 22 is connected to one end of the T head 2| by a ball and socket connection 23. The other end of the link 22 is connected to one end of the lever l0 by a slip connection 24. The arm I2 is connected to the lever IQ for actuation thereby through the medium of a link 25. One end of the link 25 is connected by a ball and socket connection 28 to the other end of the T head 2|. is connected to the free end portion of the arm I2 by a slip connection 27.

Projecting horizontally from the lower portion of the member I is an integral bracket 28. Mounted for rotary adjustment on the inner por-' tion of the bracket 28 is an arcuate cam 29 having a groove 3!] in its inner periphery. Fixed on the needle valve 18 is an arm 3| the free end portion of which travels in the groove 35. Pivotally mounted on the outer end portion of the bracket 28 is a lever 32 to the free end portion of which a cam adjusting rod 33 is connected. A link 34 connects the cam 29 to the lever 32 for actuation thereby. Ball and socket connections 35 are provided between one end of the link 34 and one end of the cam 29 and between the other end of said link 36 and the lever 32. Depending from the cam 29 is a stem 36 which is journaled in an opening 31 provided therefor in the inner portion of the bracket 28.

The other end of the link 25 3 One end It is thought that the operation of the carburetor will be readily apparent from a consideration of the foregoing. When the lever I is actuated from the accelerator, the primary air valve 1 is rotated toward open position and, through the link 22, the lever I9, etc., the needle valve I8 is rotated. When thus rotated the needle valve I8 is moved away from the seat l6 by reason of the engagement of the arm 3| in the groove 30 of the cam 29. By rotatably adjusting the cam 29, through the rod 33, the lever 32, the link 34, etc., the extent of travel of the needle valve I8 toward or away'from the seat [6 in proportion to the rotary movement of said needle valve may be regulated as desired. The slip connection 2'! permits aninitial movement of the primary valve 1 and the fuel valve l8 towardopen position independently of the secondary air valve 8. Thus, the primary air valve 1 may be substantially half opened, for example, before the secondary air valve 8 starts to open. By actuating the lever l9 through the medium of the aforementioned choke rod (not shown) the fuel valve It! may be opened to the desired extent but the air valves 1 and 8 will not be actuated due to the slip connections 241 and 21. The lever 32 is journaled on a removable pivot pin 38.

It is believed that the many advantages of a carburetor constructed in accordance with the present invention will be readily understood and although a preferred embodiment of the device is as illustrated and described, it is to be understood that changes in the details of construction and in the combination and arrangement of parts may be resorted to which will fall within the scope o the invention as claimed.

What is claimed is:--

1. A carburetor comprising a Y member including a stem having a mixing chamber therein and further including primary and secondary air intakes communicating with said mixing chamber, a fuel conduit communicating with the mixing chamber, a rotatably and slidably mounted valve for controlling the discharge of the fuel from said conduit, air control valves mounted in the primary and secondary air intakes, means for connecting the air and fuel valves together for rotation, and means operativelyconnected to the fuel valve for sliding same toward open or closed position as it is rotated, the last named means including an arcuate cam mounted for rotary adjustment on the Y member and having a groove in its inner periphery, manually operable means for adjusting the cam, and an arm fixed on the fuel valve and engaged in the groove and operable therein.

2. A carburetor comprising a Y member including a stem having a mixing chamber therein and further including diverging primary and secondary air intakes, said intakes communicating with the mixing chamber, a fuel supply conduit extending into the Y member and communicating with the mixing chamber, a seat in said conduit, a fuel control valve rotatably and slidably mounted in the Y member and engageable with the seat for controlling the supply of fuel, air control valves rotatably mounted in the primary and secondary air intakes, means operatively connecting the fuel valve to the primary air valve for rotation in unison therewith, means operatively connecting the secondary air valve to the primary air valve for actuation thereby after independent initial movement thereof, and means for moving the fuel valve toward or away from the seat as said fuel valve is rotated.

3. A carburetor comprising a Y member including a stem having a mixing chamber therein and further including diverging primary and secondary air intakes, said intakes communicating with the mixing chamber, a fuel supply conduit extending into the Y member and communicating with the mixing chamber, a seat in said conduit, 2, fuel control valve rotatably and slidably mounted in the Y member and engageable with the seat for controlling the supply of fuel, air control Valves rotatably mounted in the primary and secondary air intakes, means operatively connecting the fuel valve to the primary air valve for rotation in unison therewith, means operatively connecting the secondary air valve to the primary air valve for actuation thereby after independent initial movement thereof, and means for moving the fuel valve toward or away from the seat as said fuel valve is rotated, the last named means including a bracket projecting from the Y member, a substantially arcuate cam mounted for rotary adjustment on said bracket and having a groove in its inner periphery, an arm fixed on the fuel valve and operable in the groove for shifting said fuel valve longitudinally, and means for manually adjusting the cam.

4. A carburetor comprising a casing having a mixing chamber therein, primary and secondary air intakes communicating with said mixing chamber, respectively, a fuel supply conduit extending into said chamber, a fuel control valve rotatably and slidably mounted in said mixing chamber, a pair of air control valves rotatably mounted in the primary and secondary air intakes, respectively, means for rotating the fuel control valve and simultaneously sliding the same toward or away from closed position and comprising a rocking arm on said valve, and a cam cooperating with said arm, means for rotating one of the air valves of said pair, a slidable operating connection between said one valve and said arm whereby the latter is rocked in one direction by movement of said one valve in one direction and is independently movable in the same direction, a slidable operating connection between said arm and the other air valve of said pair whereby movement of said arm in said direction subsequently operates said other valve, and means for independently rocking said arm in said direction.

KENNETH GARFIELD HALL. 

